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* Java walkProject — emit FunctionOccurrences + CallSiteRecords.
*
* Identifies the callable shapes:
*
* - `method_declaration` inside a type body → 'method'
* - `enclosingClass` = immediate enclosing
* class/interface/record/enum/annotation_type name.
* - `constructor_declaration` → 'constructor'
* - `lambda_expression` → 'arrow'
* - one synthetic `<module-init>` per file owning the file's
* top-level structure (package, imports, type declarations).
*
* Note: Java doesn't have free-standing top-level functions. All
* methods live inside a type. The `'function-declaration'` kind is
* unused for Java; methods at any depth get kind='method' (or
* 'constructor' for ctor declarations).
*
* Body hashing: sha256 of normalized body text. Normalization:
* 1. Strip line comments (`// …` to end-of-line).
* 2. Strip block comments (`/* … *\/`). Java block comments do NOT
* nest (unlike Rust).
* 3. Strip Javadoc comments — they're a `/**` subset of block
* comments and the same scanner handles them.
* 4. Preserve string literals: both regular `"…"` and text blocks
* `"""…"""` (Java 15+). Their content is part of behavior.
* 5. Preserve char literals (`'x'`, `'\n'`).
* 6. Collapse whitespace.
*
* Call-site records:
* - `method_invocation` — `foo(...)`, `obj.foo(...)`,
* `Class.foo(...)`, `this.foo(...)`,
* `super.foo(...)`.
* - `object_creation_expression` — `new Foo(...)` invokes the
* constructor; resolver treats
* the type name as the target.
* - `explicit_constructor_invocation` — `super(...)` / `this(...)`
* inside a constructor body.
* - 'creation' edges for `lambda_expression` — reachability flows
* through closures even when their dispatch is unresolvable.
* - `method_reference` (`Foo::bar`) is NOT recorded — it creates a
* callable handle but doesn't invoke. Skipping avoids inflating
* the graph with edges that never fire at that source location.
*
* Test detection (file-level):
* - Path contains `/test/` (catches Maven/Gradle `src/test/java/`).
* - Filename ends with `Test.java`, `Tests.java`, or `IT.java`.
*
* Test detection (function-level):
* - Methods annotated `@Test` (JUnit 4/5) are tagged `inTestFile`
* even when the file path doesn't match. Inline test methods
* are a common pattern; this honors them.
*/
import { createHash } from 'node:crypto';
import { relative, sep } from 'node:path';
import type { JavaParsedFile, JavaParsedProject } from './parse.js';
import type {
CallSiteRecord,
DependencySiteRecord,
FunctionOccurrence,
ParseError,
WalkInput,
WalkOutput,
} from '@opensip-tools/graph';
import type Parser from 'tree-sitter';
const TEST_PATH_RE = /(?:^|\/)test\//;
const TEST_FILE_NAME_RE = /(?:^|\/)[^/]*(?:Test|Tests|IT)\.java$/;
const GENERATED_PATH_RE = /(?:\b(?:target|build|out|generated|generated-sources)\/)|(?:\$Pb\.java$)/;
// Type declarations that introduce an enclosing-class context for the
// methods/constructors inside them.
const TYPE_DECL_NODES: ReadonlySet<string> = new Set([
'class_declaration',
'interface_declaration',
'record_declaration',
'enum_declaration',
'annotation_type_declaration',
]);
// Call-site node kinds that the walk surfaces as 'call' records.
const CALL_NODES: ReadonlySet<string> = new Set([
'method_invocation',
'object_creation_expression',
'explicit_constructor_invocation',
]);
export function walkProject(input: WalkInput<JavaParsedProject>): WalkOutput {
const occurrences: Record<string, FunctionOccurrence[]> = Object.create(null) as Record<
string,
FunctionOccurrence[]
>;
const callSites: CallSiteRecord[] = [];
const dependencySites: DependencySiteRecord[] = [];
const parseErrors: ParseError[] = [];
const sortedPaths = [...input.files].filter((p) => input.project.files.has(p)).sort();
for (const path of sortedPaths) {
const file = input.project.files.get(path);
if (!file) continue;
try {
walkFile(path, file, input.projectDirAbs, occurrences, callSites, dependencySites);
} catch (error) {
parseErrors.push({
filePath: relative(input.projectDirAbs, path),
message: error instanceof Error ? error.message : String(error),
});
}
}
return { occurrences, callSites, dependencySites, parseErrors };
}
function walkFile(
absPath: string,
file: JavaParsedFile,
projectDirAbs: string,
out: Record<string, FunctionOccurrence[]>,
callSites: CallSiteRecord[],
dependencySites: DependencySiteRecord[],
): void {
const filePathProjectRel = relative(projectDirAbs, absPath).split(sep).join('/');
const inTestFile = isTestFile(filePathProjectRel);
const definedInGenerated = isGeneratedFile(filePathProjectRel);
const packageName = extractPackageName(file);
const moduleInit = synthesizeModuleInit(
file,
filePathProjectRel,
packageName,
inTestFile,
definedInGenerated,
);
record(out, moduleInit);
// Phase 4 (DEC-498): walk top-level `import` declarations as dependency
// sites. Owner is the file's synthesized module-init occurrence.
// Implicit `java.lang.*` and same-package imports are NOT synthesized —
// only explicit `import_declaration` nodes are emitted.
collectDependencySites(file, moduleInit.bodyHash, dependencySites);
const ctx: WalkCtx = {
file,
filePathProjectRel,
packageName,
fileInTestFile: inTestFile,
definedInGenerated,
out,
callSites,
};
const initialFrame: Frame = { ownerHash: moduleInit.bodyHash, enclosingClass: null };
for (const child of file.tree.rootNode.children) visit(child, initialFrame, ctx);
}
/**
* Walk a Java file's top-level `import_declaration` nodes; emit one
* `DependencySiteRecord` per import statement. Phase 4 of opensip's
* substrate consolidation (DEC-498).
*
* Tree-sitter-java's `import_declaration` shape (from probe):
*
* - Type import — `import com.example.foo.Bar;`
* children: ['import' kw, scoped_identifier 'com.example.foo.Bar', ';']
* specifier: `'com.example.foo.Bar'`
*
* - Wildcard — `import com.example.foo.*;`
* children: ['import' kw, scoped_identifier 'com.example.foo',
* '.' anon, asterisk '*', ';']
* specifier: `'com.example.foo.*'`
*
* - Static type — `import static com.example.foo.Bar.method;`
* children: ['import' kw, 'static' kw, scoped_identifier
* 'com.example.foo.Bar.method', ';']
* specifier: `'static com.example.foo.Bar.method'`
*
* - Static wildcard — `import static com.example.foo.Bar.*;`
* children: ['import' kw, 'static' kw, scoped_identifier
* 'com.example.foo.Bar', '.' anon, asterisk '*', ';']
* specifier: `'static com.example.foo.Bar.*'`
*
* We detect `static` by scanning the anonymous (non-named) children for
* a token whose type is `'static'`, and detect the wildcard by checking
* for a named `asterisk` child. The dotted path is the single named
* `scoped_identifier` (or bare `identifier` in the degenerate
* `import Foo;` default-package case) child.
*
* Out of scope at v1:
* - `module-info.java` `requires` directives (Java 9+ Java Platform
* Module System) — declarative module deps live there, not here.
* - Implicit `java.lang.*` imports — every Java file imports these,
* but we don't synthesize edges for non-explicit imports.
* - Implicit same-package visibility — Java doesn't require imports
* for sibling types in the same package; we likewise don't
* synthesize them.
*/
function collectDependencySites(
file: JavaParsedFile,
moduleInitHash: string,
out: DependencySiteRecord[],
): void {
for (const stmt of file.tree.rootNode.namedChildren) {
if (stmt.type !== 'import_declaration') continue;
const specifier = decodeImportSpecifier(stmt);
if (specifier === null) continue;
out.push({
nodeRef: stmt,
sourceFileRef: file,
ownerHash: moduleInitHash,
specifier,
line: stmt.startPosition.row + 1,
column: stmt.startPosition.column,
});
}
}
function decodeImportSpecifier(decl: Parser.SyntaxNode): string | null {
// `static` is an anonymous keyword child; scan all children (named +
// anonymous) for it.
let isStatic = false;
for (let i = 0; i < decl.childCount; i++) {
const c = decl.child(i);
if (c?.type === 'static') {
isStatic = true;
break;
}
}
// Named children hold the path (scoped_identifier or identifier) and
// the optional `asterisk` wildcard. Scan in order.
let path: string | null = null;
let wildcard = false;
for (const c of decl.namedChildren) {
if (c.type === 'scoped_identifier' || c.type === 'identifier') {
path = c.text;
} else if (c.type === 'asterisk') {
wildcard = true;
}
}
if (path === null) /* v8 ignore next */ return null;
const tail = wildcard ? `${path}.*` : path;
return isStatic ? `static ${tail}` : tail;
}
interface Frame {
readonly ownerHash: string;
readonly enclosingClass: string | null;
}
interface WalkCtx {
readonly file: JavaParsedFile;
readonly filePathProjectRel: string;
readonly packageName: string;
readonly fileInTestFile: boolean;
readonly definedInGenerated: boolean;
readonly out: Record<string, FunctionOccurrence[]>;
readonly callSites: CallSiteRecord[];
}
function visit(node: Parser.SyntaxNode, frame: Frame, ctx: WalkCtx): void {
if (TYPE_DECL_NODES.has(node.type)) {
visitTypeDeclaration(node, frame, ctx);
return;
}
if (node.type === 'method_declaration') {
visitMethodOrConstructor(node, frame, ctx, 'method');
return;
}
if (node.type === 'constructor_declaration') {
visitMethodOrConstructor(node, frame, ctx, 'constructor');
return;
}
if (node.type === 'lambda_expression' && visitLambda(node, frame, ctx)) {
return;
}
if (CALL_NODES.has(node.type)) {
ctx.callSites.push({
nodeRef: node,
sourceFileRef: ctx.file,
ownerHash: frame.ownerHash,
kind: 'call',
});
}
for (const child of node.children) visit(child, frame, ctx);
}
function visitTypeDeclaration(node: Parser.SyntaxNode, frame: Frame, ctx: WalkCtx): void {
const typeName = nameOf(node) ?? '<anon-type>';
// Type declarations don't emit a function — their bodies' methods do.
// Keep the same owner hash but update enclosingClass for children.
const childFrame: Frame = { ownerHash: frame.ownerHash, enclosingClass: typeName };
for (const child of node.children) visit(child, childFrame, ctx);
}
function visitMethodOrConstructor(
node: Parser.SyntaxNode,
frame: Frame,
ctx: WalkCtx,
kind: 'method' | 'constructor',
): void {
const occ = buildMethodOccurrence(node, frame, ctx, kind);
if (!occ) return;
record(ctx.out, occ);
const childFrame: Frame = { ownerHash: occ.bodyHash, enclosingClass: null };
const body = node.childForFieldName('body');
if (body) {
for (const child of body.children) visit(child, childFrame, ctx);
}
}
function visitLambda(node: Parser.SyntaxNode, frame: Frame, ctx: WalkCtx): boolean {
const occ = buildLambdaOccurrence(node, ctx);
if (!occ) return false;
record(ctx.out, occ);
if (frame.ownerHash !== occ.bodyHash) {
ctx.callSites.push({
nodeRef: node,
sourceFileRef: ctx.file,
ownerHash: frame.ownerHash,
kind: 'creation',
childHash: occ.bodyHash,
});
}
const body = node.childForFieldName('body');
if (body) {
visit(body, { ownerHash: occ.bodyHash, enclosingClass: null }, ctx);
}
return true;
}
function buildMethodOccurrence(
node: Parser.SyntaxNode,
frame: Frame,
ctx: WalkCtx,
kind: 'method' | 'constructor',
): FunctionOccurrence | null {
const name = nameOf(node) ?? '<anon-fn>';
const digest = digestJavaBody(ctx.file.source.slice(node.startIndex, node.endIndex));
const decorators = extractAnnotations(node);
const inTest = ctx.fileInTestFile || hasTestAnnotation(decorators);
const visibility = classifyVisibility(node);
const qualifiedBase = packageQualifier(ctx.packageName, ctx.filePathProjectRel);
const qualifiedName = frame.enclosingClass === null
? `${qualifiedBase}.${name}`
: `${qualifiedBase}.${frame.enclosingClass}.${name}`;
return {
bodyHash: digest.hash,
bodySize: digest.size,
simpleName: name,
qualifiedName,
filePath: ctx.filePathProjectRel,
line: node.startPosition.row + 1,
column: node.startPosition.column,
endLine: node.endPosition.row + 1,
kind,
params: extractParams(node),
returnType: null,
enclosingClass: frame.enclosingClass,
decorators,
visibility,
inTestFile: inTest,
definedInGenerated: ctx.definedInGenerated,
calls: [],
};
}
function buildLambdaOccurrence(
node: Parser.SyntaxNode,
ctx: WalkCtx,
): FunctionOccurrence | null {
const digest = digestJavaBody(ctx.file.source.slice(node.startIndex, node.endIndex));
const startLine = node.startPosition.row + 1;
const startCol = node.startPosition.column;
const simpleName = `<arrow:${ctx.filePathProjectRel}:${String(startLine)}:${String(startCol)}>`;
const qualifiedBase = packageQualifier(ctx.packageName, ctx.filePathProjectRel);
return {
bodyHash: digest.hash,
bodySize: digest.size,
simpleName,
qualifiedName: `${qualifiedBase}.<lambda:${String(startLine)}:${String(startCol)}>`,
filePath: ctx.filePathProjectRel,
line: startLine,
column: startCol,
endLine: node.endPosition.row + 1,
kind: 'arrow',
params: extractLambdaParams(node),
returnType: null,
enclosingClass: null,
decorators: [],
visibility: 'private',
inTestFile: ctx.fileInTestFile,
definedInGenerated: ctx.definedInGenerated,
calls: [],
};
}
function synthesizeModuleInit(
file: JavaParsedFile,
filePathProjectRel: string,
packageName: string,
inTestFile: boolean,
definedInGenerated: boolean,
): FunctionOccurrence {
const root = file.tree.rootNode;
const topLevelText = root.children
.map((c) => file.source.slice(c.startIndex, c.endIndex))
.join('\n');
const digest = digestSyntheticBody(`${filePathProjectRel}\n${topLevelText}`);
const simpleName = `<module-init:${filePathProjectRel}>`;
const qualifiedBase = packageQualifier(packageName, filePathProjectRel);
return {
bodyHash: digest.hash,
bodySize: digest.size,
simpleName,
qualifiedName: `${qualifiedBase}.<module-init>`,
filePath: filePathProjectRel,
line: 1,
column: 0,
endLine: root.endPosition.row + 1,
kind: 'module-init',
params: [],
returnType: null,
enclosingClass: null,
decorators: [],
visibility: 'module-local',
inTestFile,
definedInGenerated,
calls: [],
};
}
// ── helpers ───────────────────────────────────────────────────────
function nameOf(node: Parser.SyntaxNode): string | null {
const name = node.childForFieldName('name');
return name ? name.text : null;
}
function packageQualifier(packageName: string, filePathProjectRel: string): string {
if (packageName.length > 0) return packageName;
// Fallback: derive a path-based qualifier (e.g. `src/main/java/Foo.java` →
// `src.main.java.Foo`). Real Java files almost always have a `package`
// declaration, so this is only hit for hand-written one-off files.
return filePathProjectRel.replace(/\.java$/, '').replaceAll('/', '.');
}
function extractPackageName(file: JavaParsedFile): string {
for (const child of file.tree.rootNode.children) {
if (child.type === 'package_declaration') {
// package_declaration: `package` keyword + scoped/qualified identifier + `;`
for (const c of child.namedChildren) {
if (c.type === 'scoped_identifier' || c.type === 'identifier') return c.text;
}
}
}
return '';
}
/**
* Find the `modifiers` named child of a method/constructor declaration.
*
* Note: tree-sitter-java exposes the modifier list as a named child of
* type `modifiers`, NOT as a named field. `childForFieldName('modifiers')`
* returns null — only iteration works.
*/
function findModifiersNode(node: Parser.SyntaxNode): Parser.SyntaxNode | null {
for (const c of node.children) {
if (c.type === 'modifiers') return c;
}
return null;
}
function classifyVisibility(node: Parser.SyntaxNode): FunctionOccurrence['visibility'] {
// Visibility keywords appear inside the `modifiers` node as anonymous
// children with type === 'public' / 'protected' / 'private'.
// public / protected → 'exported'
// private → 'module-local' (file-local in Java terms)
// none → 'module-local' (package-private)
const modifiers = findModifiersNode(node);
if (modifiers) {
for (const c of modifiers.children) {
if (c.type === 'public' || c.type === 'protected') return 'exported';
if (c.type === 'private') return 'module-local';
}
}
return 'module-local';
}
function extractAnnotations(node: Parser.SyntaxNode): readonly string[] {
const out: string[] = [];
const modifiers = findModifiersNode(node);
if (!modifiers) return out;
for (const c of modifiers.children) {
if (c.type === 'annotation' || c.type === 'marker_annotation') {
out.push(c.text.trim());
}
}
return out;
}
function hasTestAnnotation(decorators: readonly string[]): boolean {
for (const d of decorators) {
// Matches `@Test`, `@org.junit.Test`, `@ParameterizedTest`, etc.
if (/@(?:[\w.]*\.)?(?:Test|ParameterizedTest|RepeatedTest|TestFactory|TestTemplate)\b/.test(d)) {
return true;
}
}
return false;
}
function extractParams(
node: Parser.SyntaxNode,
): readonly { name: string; optional: boolean; rest: boolean }[] {
const params = node.childForFieldName('parameters');
if (!params) return [];
const out: { name: string; optional: boolean; rest: boolean }[] = [];
for (const child of params.namedChildren) {
if (child.type === 'formal_parameter' || child.type === 'spread_parameter') {
const nameNode = child.childForFieldName('name') ?? findIdentifierChild(child);
if (!nameNode) continue;
out.push({
name: nameNode.text,
optional: false,
rest: child.type === 'spread_parameter',
});
}
}
return out;
}
function extractLambdaParams(
node: Parser.SyntaxNode,
): readonly { name: string; optional: boolean; rest: boolean }[] {
// tree-sitter-java's lambda_expression `parameters` can be:
// - identifier — `x -> x + 1`
// - formal_parameters — `(int x) -> x + 1`
// - inferred_parameters — `(x, y) -> x + y`
const params = node.childForFieldName('parameters');
if (!params) return [];
if (params.type === 'identifier') {
return [{ name: params.text, optional: false, rest: false }];
}
if (params.type === 'inferred_parameters') {
const out: { name: string; optional: boolean; rest: boolean }[] = [];
for (const c of params.namedChildren) {
if (c.type === 'identifier') out.push({ name: c.text, optional: false, rest: false });
}
return out;
}
// formal_parameters falls through to the standard extractor.
/* v8 ignore start */
if (params.type === 'formal_parameters') return extractParams(node);
return [];
/* v8 ignore stop */
}
function findIdentifierChild(node: Parser.SyntaxNode): Parser.SyntaxNode | null {
for (const c of node.namedChildren) {
if (c.type === 'identifier') return c;
}
/* v8 ignore next */
return null;
}
// ── body normalization ────────────────────────────────────────────
interface BodyDigest {
readonly hash: string;
readonly size: number;
}
function digestJavaBody(text: string): BodyDigest {
const normalized = normalizeWhitespace(stripJavaComments(text));
return { hash: sha256(normalized), size: normalized.length };
}
const digestSyntheticBody = digestJavaBody;
/**
* Strip Java `//` line comments and `/* … *\/` block comments (which
* include Javadoc `/** … *\/` — same scanner). Java block comments do
* NOT nest. Preserve string literals (regular `"…"` and text blocks
* `"""…"""`) and char literals.
*/
function stripJavaComments(text: string): string {
let out = '';
let i = 0;
while (i < text.length) {
const next2 = text.slice(i, i + 2);
if (next2 === '//') {
i = skipToEndOfLine(text, i);
continue;
}
if (next2 === '/*') {
i = skipBlockComment(text, i + 2);
continue;
}
// Text block: `"""…"""`. Must check before regular `"` because the
// opening triple-quote starts with `"`.
if (text.slice(i, i + 3) === '"""') {
const block = consumeTextBlock(text, i);
out += block.text;
i = block.index;
continue;
}
const c = text[i];
if (c === '"') {
const block = consumeStringLiteral(text, i);
out += block.text;
i = block.index;
continue;
}
if (c === "'") {
const block = consumeCharLiteral(text, i);
out += block.text;
i = block.index;
continue;
}
out += c;
i++;
}
return out;
}
function skipToEndOfLine(text: string, start: number): number {
let i = start;
while (i < text.length && text[i] !== '\n') i++;
return i;
}
function skipBlockComment(text: string, start: number): number {
// Java block comments do NOT nest. Scan to the first `*/`.
let i = start;
while (i < text.length) {
if (text.slice(i, i + 2) === '*/') return i + 2;
i++;
}
/* v8 ignore next */
return i;
}
function consumeStringLiteral(
text: string,
start: number,
): { readonly text: string; readonly index: number } {
let i = start + 1;
let buf = '"';
while (i < text.length) {
if (text[i] === '\\' && i + 1 < text.length) {
buf += text.slice(i, i + 2);
i += 2;
continue;
}
if (text[i] === '"') {
buf += '"';
i++;
break;
}
/* v8 ignore next */
if (text[i] === '\n') break;
buf += text[i];
i++;
}
return { text: buf, index: i };
}
function consumeTextBlock(
text: string,
start: number,
): { readonly text: string; readonly index: number } {
// Text blocks span newlines and end at the next un-escaped `"""`.
let i = start + 3;
let buf = '"""';
while (i < text.length) {
if (text[i] === '\\' && i + 1 < text.length) {
buf += text.slice(i, i + 2);
i += 2;
continue;
}
if (text.slice(i, i + 3) === '"""') {
buf += '"""';
i += 3;
break;
}
buf += text[i];
i++;
}
return { text: buf, index: i };
}
function consumeCharLiteral(
text: string,
start: number,
): { readonly text: string; readonly index: number } {
let i = start + 1;
let buf = "'";
let escape = false;
while (i < text.length) {
const c = text[i];
if (escape) {
buf += c;
escape = false;
i++;
continue;
}
if (c === '\\') {
buf += c;
escape = true;
i++;
continue;
}
if (c === "'") {
buf += c;
i++;
break;
}
/* v8 ignore next */
if (c === '\n') break;
buf += c;
i++;
}
return { text: buf, index: i };
}
function normalizeWhitespace(s: string): string {
return s.replaceAll(/\s+/g, ' ').trim();
}
function sha256(s: string): string {
return createHash('sha256').update(s, 'utf8').digest('hex');
}
// ── output helpers ────────────────────────────────────────────────
function record(out: Record<string, FunctionOccurrence[]>, occ: FunctionOccurrence): void {
const list = out[occ.simpleName];
if (list) list.push(occ);
else out[occ.simpleName] = [occ];
}
export function isTestFile(rel: string): boolean {
return TEST_PATH_RE.test(rel) || TEST_FILE_NAME_RE.test(rel);
}
function isGeneratedFile(rel: string): boolean {
return GENERATED_PATH_RE.test(rel);
}
|